\documentclass[a4paper,12pt]{article}
\usepackage[top=1.8in,bottom=1.8in,left=1.1in, right=1.1in]{geometry}
\usepackage{amsmath} % provides a variety of extra mathematical features
\usepackage{amssymb}  % provides a variety of symbols
\usepackage{graphicx} % for the graph, when debug, Latex, then dviPs, then psPdf
\usepackage{multirow} % for the table
\usepackage{url} % for the bib online
\usepackage{soul} % for the delete line
\usepackage{fancyvrb} % for the framework
%\usepackage[german]{babel} % for german
\usepackage[page,title,titletoc,header]{appendix} % for the appendix
% from here to next is used to number of equation access to the number of section
\makeatletter % `@' now normal "letter"
\@addtoreset{equation}{section}
\makeatother  % `@' is restored as "non-letter"
\renewcommand\theequation{\oldstylenums{\thesection}%
                   .\oldstylenums{\arabic{equation}}}
%
\bibliographystyle{plain}  % for the reference
\parindent=0cm % resolve the problem, the first line of paragraph will has two space.

\begin{document}
\input{title/title.tex}
\fontsize{12}{15pt}\selectfont % the word is 12pt and line distance 15pt
\setlength{\parskip}{1em}
%\maketitle

\thispagestyle{empty} % this page has no number
\pagebreak  % turn to a new page

\setcounter{page}{1} % start to count the page number form this page
\input{selbst/selbst.tex}
\pagebreak  % turn to a new page
\thispagestyle{empty} % this page has no number
%\begin{abstract}
\parindent=0cm % resolve the problem, the first line of paragraph will has two space.
\input{abstract/abstract.tex}
\thispagestyle{empty} % this page has no number
\pagebreak  % turn to a new page
%\end{abstract}

\input{acknowledgements/acknowledgements.tex}

\tableofcontents  % to produce list of sections and must debug two times

\pagebreak  % turn to a new page

\input{Chapter1/Chapter1.tex}
\pagebreak  % turn to a new page

\input{Chapter2/Chapter2.tex}
\pagebreak  % turn to a new page

\input{Chapter3/Chapter3.tex}
\pagebreak  % turn to a new page

\input{Chapter4/Chapter4.tex}
\pagebreak  % turn to a new page

\input{Chapter5/Chapter5.tex}
\pagebreak  % turn to a new page

\input{Chapter6/Chapter6.tex}
\pagebreak  % turn to a new page

\input{nomenclature/nomenclature.tex}
\pagebreak  % turn to a new page

\setcounter{figure}{0}
\renewcommand{\thefigure}{A\arabic{figure}} % for the figure number in the appendix
\begin{appendix}
\input{appendix/appendix.tex}
\end{appendix}
\pagebreak  % turn to a new page

\bibliography{myrefs} %for the reference, and debug once, bibtex debug once, then debug twice
\pagebreak      % turn to a new page
\listoffigures  % to produce list of figures
\pagebreak      % turn to a new page
\listoftables 	% to produce list of tables
\pagebreak

\end{document} 